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Leetcode 115: Distinct Subsequences (recursive)
#include <iostream>
#include <string>
using namespace std;
void match(const string& s, const string& t, int idxs, int idxt, int& matches) {
if (idxt == t.size()) {
if (idxs == s.size()) return;
for (int i=idxs; i<s.size(); ++i) {
if (s[i] == t[idxt]) match(s, t, i+1, idxt+1, matches);
int numDistinct(string s, string t) {
if (s=="" || t=="") return 0;
int matches = 0;
match(s, t, 0, 0, matches);
return matches;
int main() {
//string s="babgbag"; //"rabbbit";
//string t="bag"; //"rabbit";
string s="adbdadeecadeadeccaeaabdabdbcdabddddabcaaadbabaaedeeddeaeebcdeabcaaaeeaeeabcddcebddebeebedaecccbdcbcedbdaeaedcdebeecdaaedaacadbdccabddaddacdddc";
string t="bcddceeeebecbc";
cout << numDistinct(s, t) << "\n";
return 0;
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